Use the Machine Coordinate System dialog to define the orientation of the machine's axis and the location of the spindle.
To display this dialog, click the Select button in the Machine Coordinate System area of the Machine Data dialog.
The following settings are available:
Axis Orientation — Select which axis is vertical. If you select Z-Axis Vertical, the Main Spindle Location area is unavailable.
Main Spindle Location — Specify whether the machine's main spindle is on the Left or Right side of the machine.